Photographic copying and enlarging apparatus



K. LEHTO.

PHOTOGRAPHIC COPYING AND ENLARGING APPARATUS. APPLICATION FILED APR. 5.1921.

1,406,041. Patented Feb. 7, 1922.

3 SHEETS-SHEET I.

E? l M M? -K. LEHTO.

PHOTOGRAPHIC COPYING AND ENLARGING APPARATUS. APPLICATION FILED APR. 5.1921.

1 ,406,041 Patented Feb. 7, 1922.

3 SHEETSSHEET 2.

ATTORNEY K. LEHTO. PHOTOGRAPHIC COPYING AND ENLARGING APPARATUS.

' APPLICATION FILED APR-5| I92].

2 2 93 IT E E 7 H 1 3 eT FR" H d m n m P ATTORNEY PATENT OFFICE.

KUSTI LE HTO, OF MAYNARD, MASSACHUSETTS.

' PEOTOGBMHIC COPYING-AND ENLARGING APPARATUS.

Application filed April 5,

To all whom it mag concern Be it known that I, Kusrr Lnn'ro, a citizenof Finland, residing at Maynard, in the county of Middlesex and State ofMassachusetts, have invented new and useful Imrovements in PhotographicCopying and nlarging Apparatus, of which the follow-- mg is aspecification.

The object of my present invention is the provision of an apparatussusce tible of ready and nice adjustment and a apted to be used toadvantage in the copying and enlar ing of photographs.

'I o the attainment of the foregoing, the invention consists in theimprovement as hereinafter described and definitely claimed.

In the accompanying drawings, forming part hereof Figure 1 is a frontelevation of the apparatus constituting the best practical embodiment ofmy invention. that I have as yet devised.

Figure 2 is a plan view of the same.

Figure 3 is a side elevation.

contracting the accordion-like casing to position the lens.

Figure 7 is an enlarged inverted plan view of the apparatus.

Figures 8 and 9 are enlarged detail views showing the connection betweenthe'coarsethreaded lower section and the fine-threaded I tlcally 1n theslot 21 1s a 'sllde 23, and mova able vertically in the slots 21 arepins 24.

lower section of the operating shaft.

Similar numerals of reference designate corresponding parts in all ofthe views of the drawings.

For the sake of clearness I will describe my novel apparatus in detail,but I desire it understood that it is within the purview of my inventionto make various structural changes such as clearly fall within the scopeof my appended claims.

In thepresent and preferred embodiment of the invention the apparatusincludes among other elements a base made up of a platform 1 and sidebars 2 on which the platform 1 is superimposed and to which it Arrangedunder and appropriately fixed to the platform 1 is a base portion 3 ofthe speclflcation of Letters Patent.

Figure 4 is an enlarged detail rear eleva- Patented Feb. 7, 1922.

1921. Serial No. 458,785.

prises two tubular uprights 4 arranged in I spaced and parallel relationand connected together through the medium of a lower cross bar 5 and anupper cross bar 6.

Guided in the tubular uprights4 are the upright rods 7 of a verticallymovable frame, which vertically movable frame also comprises a crown bar8 and a vertical central tubular bar 9 that depends from the crown bar8.

Journaled in the base portion 3 of the fixed frame is a shaft 10 whichis provided at one end with a crank 11 and at its opposlte end with amiter gear 12. The said miter gear 12 is intermeshed with a miter gear13 at the lower end of a vertical sectlonal shaft 14 which is adapted toturn about its axis in the lower cross bar 5 and in the central tubularbar 9 of the vertically movable frame, and is provided on its uppersection with a threaded portion 15 that extends through and engages anut 16 fixed on the crown bar 8. On its lower section the shaft 14 isprovided with a comparative'ly coarse and fast thread 17, whichis'engaged with a complementary thread 18 in the lower portion of thecentral bar 9. It will also be noticed that the tubular side upri hts ofthe fixed main frame are provide in their inner sides with verticalslots 19. The spline connection between the lower and upper sections ofthe shaft 14 is shown in Figures 8 and 9.

Fixed to and superimposed on the crown bar 8 0f the vertically movableframe is an auxiliary frame 20 having a vertical central slot 21 andauxiliary slots 21*. Movable ver- Pivotally connected at 25 to the slide23 are the upper members 26 of toggle levers, the lower members 27 ofwhich are pivotally connected at 28 to the upper members and arepivotally connected at 29 together and to a swivel. head 30. At theirlower ends said members 27 are appropriately connected to the pins 24.The swivel head 30 as its- 9 and the upright rods 7 of the verticallymovable frame and movable in the slots 19 of the tubular uprights 4 is across frame 3*.

Adjustably connected at 32 to the said cross frame 3" are rods 33 whichare extended forwardly from the cross frame and are looped at 34 andthenextended upwardly.

At their upper ends the said rods 33 are provided with angularlydisposed arms 35 which are adjustably connected at 36 to the crown bar 8of the vertically movable frame.

By virtue of the adjustable connections of the rods 33 it will bemanifest that the said rods may be adjusted relatively to the verticallymovable frame so as to make the apparatus perfectly level.

Fixed to the upper portions of the rods 33 is a casing 37 adapted to.receive a ground glass plate '38 and a plate or negative holder 39, thelatterbe'ing mounted to slide into and out of the casing 37 in ahorizontal plane slightly below the plate 38.

Superimposed on and removable from the casing 37 is a hood 40 having areflector 41 at its underside and adapted to receive and 'hold anincandescent electric'lamp bulb .42,

the latter being designed to be electrically connected. through wireswith a source of electric energy. Connected to and extending downwardlyfrom the casing 37 is an accordion-like casing 43 adapted at its lowerend to carry a lens 44. The lower end portion of the said accordion-likecasing 43 is fixed' to a slide 45 movable vertically on the rods 33. v

Interposed between and connecting the T said slide 45 and the beforementioned slide able frame, the said movement of the slide 45 beingrelative to the vertically movable frame though at a less rate of speedthan the'corresponding movements of said vertically movable frame. Atand movable vertically on the tubular uprights 4 are brackets by whichare carried incandescent electric lam bulbs 51 which obviously can bemoved orizontally and vertically for copying when the apparatus is usedfor that purpose. It will also be understood that ruby bulbs can beusedfor developing.

In the practical use of my novel apparatus forcopymg purposes the plateis placed in the'holde'r" and the object to be copied is placed on theplatform 1, and the filaments of the incandescent lamps are caused toglow.

lV-hen the apparatus is to be used for enlarging purposes, the bromidepaper is superimposed on the platform 1, and the negative is placedonthe holder 39.

, he adaptability of the hood 40 to be lifted off-the casing 37 isadvantageousinas; much as it permits of ready inspection of the interiorof said casing 37. Y

It will be apparentfrom the foregoing that when the'vertically movableframe is raised in the manner described, the focus will be lengthenedfor the enlargement of an object on 'the'platform 1; also,that inconcert with the raisin of the vertically movable frame the lens ismoved nearer to l the negative thereby assuring a sharp focus atdifferent heights. In other words the focus is automatically corrected.

' Manifestly the hereinbefore described spline connection between thelower and upper sections of the shaft 14 will provide for theendwisemovement of one shaft section relatively tovthe other, necessaryin view of the fact that the thread 17 is a coarse thread and the thread15 is a fine thread.

Having described my invention, what I claim and desire to secure byLetters-Patent, 1s:

1. Apparatus for the purpose described comprisinga fixed frame, amovable frame, a. casing connected to the movable frame, anaccordion-like casing carried by said casing and .adapted to carry alens, a slide connected with the accordion-like casing, means carried bythe movable frame on which means the slide is movable, means to move themovable frame, and means to move the slide relatively to the movableframe and in concert with the movement of said frame, the said means formoving the frame comprising a shaft having a thread engaginga-complementary thread of the, frame and also having a finer threadengaging a complementary fine. thread of the frame, toggle leversconnected with the shaft, a slide connected with and movable by saidtoggle levers, and a connection between said slide and the first-namedslide.

2. An apparatus for the purpose described comprising a platform, meansto support the same, a fixed frame having a portion arranged under andfixed to the platform and also having spaced and parallel tubularuprights vertically slotted at their inner sides, a shaft journaled inthe said frame portion and havin a crank and miter gear, a verticalshaft havlng; a lower coarse thread and an upper finer thread and alsohaving a miter gear intermeshed with that of the firstnamed shaft, avertically movable frame having upright portions guided in the tubularuprightsand a crown bar connecting said portions and also having acentral vertical portion receiving the second-named shaft and threadsfor the engagement of the threads of said shaft and further having across frame inter osed between the upright portions and mova ble in theslots of the frame uprights, a slotted frame on the crown barof themovable frame, upright rods adjustably connected with the crown bar andsaid cross frame,

a slide movable on said rods, a slide movable in the slot of the frameon the crown bar and connectedwith the first-named slide, a swivel headon the second-named shaft,

toggle levers connected with the frame on the crown bar and also withthe swivel head and the second-named slide, a

casing connected to the said rods and open at its upper sideand adaptedto contain a adapted to carry an incandescent electric lamp bulb.

vIn testimony whereof I atfix my si nature.

KUSTI LE 4. TO.

